libbb: make bb_common_bufsiz1 1 kbyte, add capability to use bss tail for it

The config item is FEATURE_USE_BSS_TAIL. When it is off (default):

function                                             old     new   delta
read_config                                          210     228     +18
doCommands                                          2279    2294     +15
ipneigh_list_or_flush                                763     772      +9
ipaddr_list_or_flush                                1256    1261      +5
display_process_list                                1301    1306      +5
conspy_main                                         1378    1383      +5
do_lzo_compress                                      352     355      +3
do_lzo_decompress                                    565     567      +2
push                                                  46      44      -2
inetd_main                                          2136    2134      -2
uevent_main                                          421     418      -3
addLines                                              97      92      -5
bb_common_bufsiz1                                   8193    1024   -7169
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 8/5 up/down: 62/-7181)        Total: -7119 bytes
   text	   data	    bss	    dec	    hex	filename
 829850	   4086	   9080	 843016	  cdd08	busybox_old
 829901	   4086	   1904	 835891	  cc133	busybox_unstripped

FEATURE_USE_BSS_TAIL=y:

read_config                                          210     228     +18
doCommands                                          2279    2294     +15
ipneigh_list_or_flush                                763     772      +9
ipaddr_list_or_flush                                1256    1261      +5
display_process_list                                1301    1306      +5
conspy_main                                         1378    1383      +5
do_lzo_compress                                      352     355      +3
do_lzo_decompress                                    565     567      +2
inetd_main                                          2136    2134      -2
bb_common_bufsiz1                                   8193       -   -8193
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 8/1 up/down: 62/-8195)        Total: -8133 bytes
   text	   data	    bss	    dec	    hex	filename
 829850	   4086	   9080	 843016	  cdd08	busybox_old
 829911	   4086	    880	 834877	  cbd3d	busybox_unstripped

FIXME: setup_common_bufsiz() calls are missing.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

4 files changed, 7 insertions, 3 deletions

diff --git a/archival/cpio.c b/archival/cpio.c
index 82b3fe5ed..a3036e1ab 100644
--- a/archival/cpio.c
+++ b/archival/cpio.c
@@ -11,6 +11,7 @@
  * Only supports new ASCII and CRC formats
  */
 #include "libbb.h"
+#include "common_bufsiz.h"
 #include "bb_archive.h"
 
 //config:config CPIO
@@ -170,7 +171,7 @@ enum {
 struct globals {
         struct bb_uidgid_t owner_ugid;
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 void BUG_cpio_globals_too_big(void);
 #define INIT_G() do { \
         G.owner_ugid.uid = -1L; \
diff --git a/archival/lzop.c b/archival/lzop.c
index a5fc01941..1371c9751 100644
--- a/archival/lzop.c
+++ b/archival/lzop.c
@@ -71,6 +71,7 @@
 //usage:     "\n        -F      Don't store or verify checksum"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 #include "bb_archive.h"
 #include "liblzo_interface.h"
 
@@ -443,7 +444,7 @@ struct globals {
         chksum_t chksum_in;
         chksum_t chksum_out;
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { } while (0)
 //#define G (*ptr_to_globals)
 //#define INIT_G() do {
diff --git a/archival/rpm.c b/archival/rpm.c
index 105394481..079b7a95b 100644
--- a/archival/rpm.c
+++ b/archival/rpm.c
@@ -29,6 +29,7 @@
 //usage:     "\n        -qpc    List config files"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 #include "bb_archive.h"
 #include "rpm.h"
 
@@ -93,7 +94,7 @@ struct globals {
         rpm_index **mytags;
         int tagcount;
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { } while (0)
 
 static void extract_cpio(int fd, const char *source_rpm)
diff --git a/archival/tar.c b/archival/tar.c
index 23ac00e86..caf4363de 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -146,6 +146,7 @@
 
 #include <fnmatch.h>
 #include "libbb.h"
+#include "common_bufsiz.h"
 #include "bb_archive.h"
 /* FIXME: Stop using this non-standard feature */
 #ifndef FNM_LEADING_DIR